Cadillac ATS vs Honda Civic Si Dimensions & Size Comparison
Comparing 2018 vs 2022 catalog dimensions. Cadillac ATS · Honda Civic Si
- Length182.8 in – 183.6 in
- Height54.8 in – 56.4 in
- Wheelbase109.3 in
- Ground clearance5.9 in
- Curb weight3,373 lb – 3,693 lb
- Width71.1 in – 72.5 in
- Honda Civic Si width70.9 in
Which is bigger?
- Length: Cadillac ATS is 0.8 in shorter (183.2 in vs 184.0 in)
- Width: Honda Civic Si is 0.9 in narrower (71.8 in vs 70.9 in)
- Height: Cadillac ATS is 0.1 in taller (55.6 in vs 55.5 in)
- Wheelbase: Cadillac ATS has a 1.6 in longer wheelbase (109.3 in vs 107.7 in)
- Curb weight: Cadillac ATS is 577 lb heavier (3,533 lb vs 2,957 lb)
Biggest size differences
- Curb weight: Cadillac ATS is 577 lb heavier (3,533 lb vs 2,957 lb)
- Wheelbase: Cadillac ATS has a 1.6 in longer wheelbase (109.3 in vs 107.7 in)
- Width: Honda Civic Si is 0.9 in narrower (71.8 in vs 70.9 in)
- Length: Cadillac ATS is 0.8 in shorter (183.2 in vs 184.0 in)
- Height: Cadillac ATS is 0.1 in taller (55.6 in vs 55.5 in)
Practical verdicts
- Easier to fit in a short garageCadillac ATS — Cadillac ATS is shorter by 0.8 in Check garage fit for Cadillac ATS · garage fit for Honda Civic Si
- Narrower for tight parkingHonda Civic Si — Honda Civic Si is narrower by 0.9 in
Dimension comparison
| Spec | Cadillac ATS | Honda Civic Si | Difference |
|---|---|---|---|
| Length | 183.2 in | 184.0 in | 0.8 in |
| Width | 71.8 in | 70.9 in | 0.9 in |
| Height | 55.6 in | 55.5 in | 0.1 in |
| Wheelbase | 109.3 in | 107.7 in | 1.6 in |
| Ground clearance | 5.9 in | — | — |
| Curb weight | 3,533 lb | 2,957 lb | 577 lb |
Values use trim midpoints when a model year lists a range (e.g. length 182.8 in – 183.6 in).
Compare by year
Overlapping model years with dimension data.
Already own one of these cars?
Jump to maintenance sizes on the vehicle page — tires, wipers, battery, and oil when present in the catalog.